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It is a USB Voltage Current Meter,Measuring range: DC 3V-8V, current :0-3A (accuracy: ±1%), Maximum support 6A .(more than 3A , accuracy will be about 3% ),Voltage and current in turn shows that interval of about 3 seconds.

Features:

1, The power meter can be used to
measure voltage and current of USB-powered devices, USB terminal
equipments with load or no-load.